/*
 * Copyright (c) 2025, NVIDIA CORPORATION.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.nvidia.spark.rapids

import org.apache.spark.rapids.hybrid.HybridExecOverrides
import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.catalyst.rules.Rule

/**
 * The collection of rules for GpuOverrides which will be injected into the logical plan resolution
 * phase by `SparkSessionExtensions.injectPostHocResolutionRule`. As its name suggests, it will
 * be applied after the logical plan has been resolved.
 */
case class GpuPostHocResolutionOverrides(spark: SparkSession) extends Rule[LogicalPlan] {

  @transient private val rapidsConf = new RapidsConf(spark.sessionState.conf)

  override def apply(plan: LogicalPlan): LogicalPlan = {
    // If the hybrid backend is enabled, we need to resolve potential hybrid scan hints
    Option(rapidsConf.loadHybridBackend).filter(identity).map { _ =>
      HybridExecOverrides.resolveHybridScanHint(plan)
    }.getOrElse {
      plan
    }
  }
}
